Furnace-door protector.



No. 886,144. PATENTED APR. 28, 1908. H. J. MARX.

FURNACE DOOR PROTECTOR.

APPLICATION FILED SEPT. 13, 1907.

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HENRY J. MARX, OF HOLYOKE, MASSACHUSETTS.

FURNACE-DOOR PROTECTOR.

T o all whom it may concern:

Be it known that l, HENRY J. MARX, a citi- Zen of the United States, residing at Holyoke, county of Hampden, State of Massachusetts, have invented certain new and useful Improvements in Furnace-Door Protectors, of which the following is a full, clear, and exact description.

My invention relates to furnace door protectors, and has for its object to produce a protector or lining which, when in position, can readily expand and contract without buckling under the influence of variations in temperature,

It further has for its object to produce such a protector adapted to be secured to doors now in use by the same means as the old protectors, so as to be easily substituted for old protectors. Furnace door protectors as now constructed are made of one piece of metal rigidly -secured to the inner face ofthe door. When such a protector becomes heated it eX- pands more than the furnace door itself because it is heated more intensely, and, therefore, tends to buckle, and after being used for a short time does buckle and later breaks and has to be replaced.

The object of my invention is to produce a door protector which shall be securely connected to the door-and yet be free from the objection above referred to.

The following is a description of an embodiment of my invention, reference being had to the accompanying drawings, in which Figure 1 shows an .elevation of my protector secured to a furnace door; Fig. 2 shows a vertical section of the center of the door with one half of my protector secured thereto; Fig. 3 shows a vertical section of the furnace door with the other half of the protector secured thereto.

Referring more particularly to the drawing, A is the furnace door, with ordinary hinges B, and revoluble damper O. The protector is cast, or otherwise formed, in two parts D-D, which are secured to the furnace doorby bolts or screws E-E. The two parts of the protector each have a plurality of overlapping projections F-G-H and F-G-H. Each of the projections G-G is in a different vertical plane from the other projections on the same part and in the same plane as the other projections on the other part. The part G thus fits into a recess between the parts F and H, and the specification of Letters Patent.

Application filed September 13, 1907.

Patented April 28, 1908.

Serial N0. 392,615.

part G fits into the recess between the parts F and H, projections and corresponding recesses being thereby formed in and upon each member D-D, which connect the two parts of the protector, preventing them from sagging in the middle and holding them in alinement. There is considerable space between the opposing end surfaces when cool.

The buckling which is to be especially avoided is that which takes place by reason of the expansion along the greatest dimension of the door, and by the arrangement shown and described, the protector is enabled to eXp and and contract in that direction without producing any buckling stress. EX- pansion in the other direction is also permitted at the center where theI heat is greatest, by reason of the interlocking construction which, while forming sockets so as to hold the parts in alinement, does away with any continuous metallic vertical portion across the protector at that point, the projections on each member being connected together only through their common base so as to be toothlike and the sockets permitting some vertical expansion of the projections.

Furnace door protectors as thus constructed last a very long time and largely eliminate the cost of new protectors, and the time and labor which otherwise has to be expended in replacing protectors which have buckled or broken. When properly shaped they can be substituted for protectors now in use on old doors, without change in the construction of the door itself.

The invention permits of being embodied in various forms, but the form that I have shown and described is that preferred by me, and, as above stated, avoids the difficulties hereinabove expressed.

What l claim is- 1. The combination of a furnace door of a furnace door protector consisting of a plurality ofperforated parts having overlapping portions correspondingly perforated, an means for securing said parts to the door.

2. The combination with a furnace door of a protector consisting of a plurality of parts having alining means connecting said parts and permitting relative to-and-fro and upand-down movement of the abutting end surfaces of said parts, and means for securing the outer ends of said parts to the door.

3. The combination with 'a furnace door of a protector having a plurality of parts, said parts each having projections in different vertical planes to slidably engage the adjacent part, and means for securing the outer ends of said parts to the door. je 4. The combination with a furnace door of a protector consisting of a plurality of perforated parts, a plurality of projections on the adjacent edges of said parts, overlapping and slidable upon each other in both Vertical and horizontal planes, and a damper in the furnace door.

5. The combination with a furnace door of a protector consisting of a plurality of perforated parts, a series of alternating projections on the adjacent edges of said parts slidalole upon each other and correspond ingly perforated, and a revoluble darnper inV the door.

6. The combination With a furnace door, of a protector consisting of a plurality of perforated parts each having a plurality of toothlike projections in different Vertical and horizontal planes, the projections on one part having a horizontal and Vertical sliding engagement with the projections on the other part, said parts being independently secured to said door.

HENRY J. MARX. Witnesses:

A. N. LA PORTE, A. H. LABALLE. 

